<div class="el-tree"  role="tree">
    <el-tree-item *ngFor="let item of model" [model]="item" [indent]="indent"> </el-tree-item>
    <div class="el-tree__empty-block" *ngIf="!model"> <span
            class="el-tree__empty-text">{{ emptyText }}</span> 
        </div>
</div>